Watts PWR4021 - Manual (Page 13)

13
RO System Troubleshooting
PRoblem coRRective action
General
high Product Water tDs
Membrane expanded. Replace membrane.
Membrane attack by chlorine Carbon pre-filter may be exhausted. Replace with a new cartridge.
Clogged pre-filter-creates pressure drop and low reject flow. Replace pre-filter cartridge.
Feed pressure too low. Feed pressure must be at least 20 psi.
Insufficiently flushed post-filter cartridge. Flush post-filter with pure water.
Brine seal on membrane leaks. Determine if seal or O-ring is bad. Replace as needed.
no Product Water or not enough Product Water
Feed water shut off. Turn on feed water.
Low feed pressure. Feed pressure must be at least 20 psi. Consider booster pump.
Pre-filter cartridge clogged. Replace pre-filter cartridge.
Membrane fouled. Determine and correct cause; replace membrane.
Product check valve stuck. Replace check valve fitting.
Low pump discharge pressure Open pump discharge valve, replace pump
Membrane fouled. Determine and correct cause; replace or clean membrane.
Product check valve stuck. Clean or replace check valve.
Low pump discharge pressure Adjust reject valve or replace pump
item numbeR DescRiPtion
1 Pre filter housing 20" Big Blue
2 RO Membrane Pressure Vessels 4" x 40" SS
3 Pressure Gauge, 2", 0-100psi, Dry
4 Pressure Gauge, 2 1 ⁄
2
", 0-400psi, LF
5 Flow Meter 1-10 gpm (product)
6 Flow Meter 1-10 gpm (reject)
7 Motor Starter Contactor, 16 amps, 24 volt coil
8 Overload Relay 8 - 14 amps
9 Overload Relay 6 - 8.5 amps
10 Pump & Motor CR2-180U 5hp, 3-Phase
11 Low-pressure Switch, 6.5psi
12 Inlet Solenoid Valve, 1", 24 volt coil
13 Watts 4 x 40 RO Membranes
14 CI 1000 Controller
15 Conductivity Probe
16 Autoflush Solenoid Valve, 1 ⁄
2
", Brass, 24 volt coil.
IV. Replacement Parts List
A list of common replacement parts is provided below. All of these
parts are not used on every system and all of the parts are not listed.
Contact you dealer for replacement parts assistance.
V. Membrane Replacement
1. Turn off the system and close the feed water shutoff valve.
2. Disconnect the membrane feed hoses by loosing the brass fit-
tings between the end of the hoses and the pressure vessel end
caps.
3. Remove the retaining “U” pins from the pressure vessels.
4. Push the old membrane out of the vessel in the direction of the
feed flow. (See flow arrows on the right side of figure #1)
5. Record the serial numbers of the new membranes.
6. Lightly lubricate the brine seals on the new membranes with
clean water.
7. Install the new membranes in the direction of flow with the brine
seal end going in last.
8. Lightly lubricate the end cap internal and external O-rings with
glycerin.
9. Install the end caps and secure them with the “U” pins.
10. Install the membrane feed hoses.
11. Verify that all retaining “U” pins are installed.
12. Follow the start up procedure in section III-D.
Brine
Seal
Flow Direction
Membrane